monoplacophoran

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monoplacophoran

(class Tryblidia), any of a group of primitive marine mollusks characterized by a single, cap-shaped shell and bilateral symmetry. The term Tryblidia is preferred over Monoplacophoran and Galeroconcha, because both latter terms are taken to include several fossil groups of uncertain relationships.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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